Among the following correct basic strength order is
i) La(OH)₃
ii) Ce(OH)₃
iii) Lu(OH)₃

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i > ii > iii

iii > ii > i

i > iii > ii

iii > i > ii

answer is A.

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Detailed Solution

As the size of the lanthanoid ions decreases from La³⁺ to Lu³⁺, the covalent character of the hydroxides increases and hence the basic strength decreases. Thus, La(OH)₃ is the most basic whereas Lu(OH)₃ is the least basic.

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